Improvement in check-valves



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DARWIN ALNSON GREENFLOF NEW YORK, il. Y.

Letters Patent No. 103,872, dated Jun@ 7 1870.

IMPROVEMENT IN CHECK-VALVES- The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be itknown that I, DARWIN Atlas-'sox GREENE, of the city, county, and State of New York, have invented certain new a-ndv useful Improvements in Check-Valves andtheir accompanying part-s; and I do hereby declare that the following is a full and exact description thereof.

My improved device may serve as a check-valve on the feed-pipes of locomotives, and in analogous situations between a complet-e pump and the boiler or a correspondingr vessel. In such cases lthere will be independent delivery-valves to. the pumps, and my eheckvalves will be only additional safeguards against a flow ot' water in the wrong direction.

My device may also serve as the only safeguard against the reflow of water or other fluid; in other words, it may be the only delivery-valve of a pump. It may also serve as a stop-valve, being provided with means for very eiiiciently holding it down when required. l

My invention relates to the construction and arrangement of the valve and of its guiding and controlling means, and to a certain arrangen'ient or relation of' apet-cock or drain-cock to the several passages or chambers pertaining thereto.

I have devised very efficient means for guiding the valve or valves, and have so connected therewith a. pet-cock or try-cock, that the pressure or condition of the appara-tus on both sides ofthe valve, in all the chambers of the more complex forms, may be tested by a single cock.

I will first describe what I consider the best means of carryingout my invention, bot-h with single and duplicate valves in my apparatus, and will afterward designate the points which I believe new therein.

The accompanying drawing forms a part of' this specification. The iirst figures represent the most complicated form. The succeeding figures representl the simpler forms.

Figure 1 is a central vertical section on the line "1 T, in fig. 2.

Figure 2 is a horizontal section on twoI different planes, as indicated by the line S S, in fig. l. It is a central section at the screw connections, and a more elevated section at the valve-seats. The construction represented in gs. 1 and 2 has four valves and one pet-cock or tr -cock, adapted to serve all the chambers.

Figure 3 is a central vertical section of' a form of the invention in which there are only two valves, with one,petcock, draining the smaller number of chambers therewith presented.

Figure 4 is a cross-section on the line S Spin fi". 3.

Figure 5 is a side elevation of the simplest form..

In this there is only one valve, and it a simple checkvalvc, without any means for closing` it at will.

Figure (j is aeentral vertical section ofthe same.

Similar letters of reference indicate corrcspomling` parts in all the figures.

'lo facilitate the description I will commence with the simplest form of' the invention-that shown in figs. 5 and (S. l

A is a casing of brass or other suitable material, which serves as thc main body. It -isprovided with a screw-cap, A, which forms a tight joint, and thcre with guides, or in all the forms aids in guiding, the movable part, which is the valve proper.

The body of the valve proper is marked B, and a cylindrical extension or stem which projects up in a smoothly-bored cavity in the cap is marked B.

There are holes in the lowest part oi' the hollow stand which allow' the water to flow out and in freely, in case the closeness of the tit between the stem IS' in the cavity ofthe cap A might otherwise endanger the rapidity and freedom of' the movements.

C is the plug of what corresponds to a petcock, having a small opening directly through it, marked c, This opening may, by turning the cock, form a comm nnication between the passages Il di, and'thus make a free communication with the yexternal atmosphere' on the left side, or pump side, or receiving side ot' the valve. Or it may, by heilig turned in a -ditierent position, form a communication between the passages h h?, and thus form a free exit or communication with the atmosphere from the boiler side or delivery side ofthe valve. Or, again, by turning the plug C in the third position, as will be readily understood from the figures, it may be closed entirely. The latter is the position in which the plug of this cock will usually stand. The plug C may bc turned by applying the thumb and finger, or any suitable wrench, key, or the like, to the projecting end.

, 'Iherc arc two sets of screw-connections l in the more complicated form, and, as it is important to avoid confusion in the description, I designate the connection through which the water is received M, and the connection through which the water is discharged N, giving other letters to the other connections, as will appear below.

It will be observed that no means are provided in this simple form, shown in figs. 5 and 6, for holding the valve tightly closed. It is simply a check-valve or delivery-valve, ready at any time to be raised by a slight force, and allow the water to be moved in one direction, and always ready to drop and prevent its returning, the peculiar pet-cock discharging fiomeither side, or holding -thc whole tight, according to its posi# tion.

- Figs. 3 and 4 show two valves and a connection for a pump. lhis pump-connection is marked P1. In this form the body, the screw-connections, the caps, and the test passages are marked by the same letters as above, so far as they correspond thereto. But there are some additional part-s which it is important to describe. v

lOne valve, B B', is formed and mounted as in fie. 6.

It is always free to rise and allow the water to pass.v

The other Yalve, similarly lettered on the left, is similarly constructed, but the screw-cap is elongated upward, and is tapped, and is provided with a stuingbox, and carries a threaded stem, H, operated as represented, which stands within the hollow stem B' of the valve propel', and aids to guide the latter. The said stem H also performs the additional functions of limiting the rise oi' the valve proper B B.to any given height, and, when desired, ofiirmly and tightly holding the valve down to its seat, so as to make it an absolute stop-valve.

The pinnp-councetion l is made to an intermediate chamber, or what I term a pump-chamber, J. It is intended to receive a pump, (not rcpresented,) which, being properly worked by a reciprocating plunger or piston, alternately draws the water into itself and forces it'out again.

My entire device, thus connected and worked, fulfills the function of both the induction and eduction-valves of a pump, as also ot' testing all parts in the manner ordinarily eilectcd'by a separate try-cock or pet-cock on each part.

' rlhe additional channels fl j'Z for testing in this form ofthe device are connected to the central chamber or pump-chamber J l, by which I'mean the chamber intervening between the two valves, B B'. The plug of the pet-cock is represented in these figures as standing in the position which drains the said pumpchamber. It will be readily understood how it may be turned in the position to drain either of the other v parts, or to stop the whole tightly.

Figs. 1 and 2 represent a quadruple forni of the invention. Here the passages M N, as before, receive and discharge the water, through suitable pipes not represented. "lhere are two pump-connections, l" P2, which may be worked simultaneously, oreithcr alone. The working of one has no influence on the other, except in an almost ina-ppreciable degree to diminish the pressure in the induction-pipe and chamber, and to increase it in the eduction-pipe and chamber by necessarily increasing the rapidity with which the water or other fluid is compelled to move.

In iig. 2 the valve-seats alone are represented, and the letters indicating the'valves are, ot' course, omitted. The arrows indicate very plainly the direct-ion oi' the water. Suppose both pumps are working, the

4nection with the receiving-pipe M.

action ot' the pump at the screw-connection l)x draws in water through the pipe M, and causes it to pass up through the screw valve-seat on the left-hand npper side, tig. 2, into the chamber Jl, whence it iiows out into the pump through the screw-connection l. 0n the return ofthe plunger this water is discharged through the corresponding discharge-valve on the right-hand upper side, fig. 2, (shown in elevation in iig. 1,) and passes out through the screw-comieetion N. A precisely srnilaraetion takes place in the other side of my compound structure, to wit, the lower side in iig. 2, the'water being alternately drawn out into and returned from the pump, which is connected at the point l.

The pet-cock C iu this form of the device stands with 4its axis at right angles to the pumps and councetions. It vents in the line of its axis, and has but one side passage through which the water or other fluid will be received, as will be readily understood from the figures. p

When this central cock is turned in the direction represented it tests the condition of the receivingehamberot the apparatus, that part which is in con- \Vhen it is turned directly opposite it tests the condition ofthe delivery-pipe, or the chamber which is connected with the delivery-pipe through the screw-connection Y. When it is turned only ninety degrees in either direction it tests thc` condition in the corresponding pump-chamber Jl or J2. In any of the intermediate positions it tests or vents neither ot' the chambers.

I claim- 1. The try-cock plug C, arranged as represented relatively to one or more valves, B, so to test the pressure or condition on either side thereof at will, as represented.

2. In combination, a puppet-valve, having a hollow vented stem, B1, a` screw-stem, H, fitted within the same, and a pet-cock adapted lto test the pressure or drain the water from the chamber on either side thereof, combined in the single casing A, as herein set forth.

3. The within-described arrangement of one or more pump-connections, Pl l, with a corresponding pumpchamber or chambers, J J 2, so that the entire valvehousing and valves shall be contained 'in one easing, separate from thev barrel of the pump, and adapted to be test-ed in all its chambers, all substantially as and for the purposes herein set forth.

ln testimony whereof I have hereunto set my naine in presence of two subscribing witnesses,

D. A. GREENE.

Witnesses:

WM. O. D nv, R. RoULs'roN. 

